Yale Environment 360: As if soaring global temperatures werent bad enough, scientists reported this week that microbes are also speeding up the melting of Arctic ice. The problem lies in cryoconite, the soil-like composite of dust, industrial soot and photosynthetic bacteria that darkens the surface of ice and causes it to melt, scientists from Aberystwyth University in Wales said. As it melts, ice leaves behind small water-filled holes full of bacteria. The sun-loving microbes then shape the pockmarks depth and size...